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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84ce33fec6130125ad5f27b44e71a07003d9504bd03c5d93f54dc4023279e77' 
  AND token = '6Sdd5vtPYcE33c/GB8rMahuWCKYo7/EIzJfgbE8Gk48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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