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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf72145cc75688e36ef29c8ac78c78a5544db86fe28c9f376c4e2308c2356ff' 
  AND token = '5m7v81D4tPeKEwPGcZQ2Ai1YLQFw1EAWKxYWuT3ckQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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