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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '045f479082e22721f5cf786e76f4e2ef61bc32c1af2067bf428135d2149524f0' 
  AND token = '6uzPPEmUFzqXlF35ACrPVnxdBN4pCOqWfbkM46qMMtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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