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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e522136656f45a75421152c907029c19a3b510f4aa82caeff34350075abc96c4' 
  AND token = 'dlOJBn+95SCog6DwDvmxd5QihondRiIJQNSeGDs7CQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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