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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8975a3592e8d94b863e2848f608419e13d0309dd599759daa2a19050ab209e77' 
  AND token = 'eBLwukBCcs7ZlrXJwuQXrseM48m82FunnyrJ8JQmG4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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