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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a025176a55bf4df4c58e16a71a79fbda59dcbe8ac5a2fdc909622644d032ebfa' 
  AND token = 'LTtOt0+RiJp3Yfrzh12nwTdZD1VvH87dGaU6vGwWoGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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