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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30bd6df4a9c0f7f849ac73fdd104f08c5e6ed55f05b711bd68e0ab09ee6b005d' 
  AND token = 'D9eLnY1OzXQ13yNWQUDpd5ovpk7j3gylz7QzsP4Qfck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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