SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da9c819d2d5f694e839ad3b7a560986dfedb596df540ec335cfc6c70f1097bc' 
  AND token = 'CvgnJIylOLPGjhlcoF466W7GG1ruD2VUfoYb5fqu5+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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