SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83f92c85ed96b10c7b9fdfbd99d0fb3c7516ea968382a8b236dbae6f7278ca2' 
  AND token = 'xs9zO6X1lGPmCItIeaykJRsZW4J5pfvsqxYIg/I4j0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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