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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc45671b644204a466b05e62a56eab80f682f82a45db46721f0cc3ccebf024cd' 
  AND token = 'Gk18UnMkoZIYBSdTnRadtO7UhaaL0Okn7d2rohwxe3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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