SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf1ba0d4e78635f97368aa6850139333427b630a661b1c9bc0c5f7ab7df636b' 
  AND token = 'IGNuHKpLW6Blp82/ak8rD/w7nqH2LsWkh7JVVouDKvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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