SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b7647426f72081c7f5d02ace41ccbfefc6b98c2fc9367622f06e0a8223079e' 
  AND token = 'XBTeqosdVc7DsuJvZRjfRpLJXEjzRu52jniRX8hGv/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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