SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccca05bf31fe7a89595e44b35c132d63d8bbf63f7de5d86a978189c2104287aa' 
  AND token = 'zMvuvLyNnKo0O/3JZpV22c+0IvQgogVjkf45esp3J2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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