SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '706182fcb08b336cbde4ef9faba95a93a33a2dc1079989c76a23708991ccef61' 
  AND token = 'KW8yoQznuIYZ5Q1/ZHJmmm9+FuLQ+Ijd1XNVwhQPk/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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