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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1775cfe887b856324e1e068f2123d010538cc32b3708b6bf3876245e07abf232' 
  AND token = '8Ja4Z0RYMTJ3FEkEPyuIpLWoRUk55t6r6FaGA0lTCwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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