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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c63798afe814f22d8a21ece075b2996826e1ddf5063998373fdd36a6cc390ec' 
  AND token = 'Fm6wkoiS3wg9Y3AskdXEJzTeFWXQFJm3+KS9kaWeej4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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