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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb85f953b8f4e72ee7f6ac3b346ba44f7f63227c3ef001e0ff00b30a98dc29f' 
  AND token = 'xXFjJJhDYK5rNSadkkay/N0QoxPPWZ5HdYCfi/PyQ0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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