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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18015e65c700e6ebae9b34ba6a648fa4aae897638c4cf7201263ce12228497e4' 
  AND token = '1PNn6TXqkINw1hAeWYm2t6lHMBDIyEedM+WUN/PRjhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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