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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e585cfa640ce982ad6f4c7d9589823a7e84902b50016660215ec39c9cf2e4dc' 
  AND token = 'mL0H+XH9e3gDeIdPCqQdD8d1zpIyIw0QAoYi91kghkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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