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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c54522c2359b5c63cebc96414343c6bd0d10333593d2979b460937eecc31c0e' 
  AND token = 'xFOTXAdEkdjxS6Sx2QEA0ULpa8a69S8zlzGYd8s5FP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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