SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dedb839a251a64394505025e472997e57c1ce326795ea78be71630c9ca02fa' 
  AND token = 'qKhzSZJRxOoqvWxTuhrzD526ErEzWJVxhXDKroO1grc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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