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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e6d3b1c7b5e15e7a74741791c489dabb55d3f8b7dc820bdbb3c97ce6885704' 
  AND token = 'UNBwYf6uqfq1mlaftlFqcj2M/pAllS0bg0oqhP3YAes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}