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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '477d224fa9c268823299c550135b480eb511c07b283c9ac5fad9b4f50a6bd05c' 
  AND token = '2BAiW/EqwPW1Te76HGOR/Pn7z8M0sDsnDfr9XaXXgC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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