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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe6613343300f7f36b668748370b8b70a9d59e88531b659ea2261d70998040ad' 
  AND token = 'IHLS1tp25agpU9mf5Y/zBfcEkgiEMzcU+Gjont/5qG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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