SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1f32c49c1e9968c4736f030f98e15d0a573365f714232606719d52dc3cf4f8' 
  AND token = 'ULJ/PgjEBf1s2+o+TFDypMsY4zp5P7eD1fCGfBnIhvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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