SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054530bfd7ca35618e936f6eae0fb13fc175749ddb3c74b8943159fbcaa3c773' 
  AND token = 'BTdhyLK7MxsdNRS438C1Yo859qmA6oGN/BBmwZzivzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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