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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725f90c86ee00c8872c778fec1da0053b88872d27a1579f3db1aa19adf40384d' 
  AND token = 'B9QVyDu2rBfrTmqfh5ldMJNdG0iTNMxjQZB0rcTAZO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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