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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a99bd25cb0123a820eb1ba9e4676a14e02b9dded4d4e475ae81c2f0a477c7e9' 
  AND token = '5Wgu6SDThQWidhmLJy9W9cIlJoMfOvISdPe7KaOVVIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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