Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c65b5d0b54f243692dd62b1cacb8bfb30619a39ba8a37aaec74573790a816302' 
  AND token = 'rBtrnAwa0sAAl8aMtlf/+dw0a3YVuNn6IdXl7m0ZwUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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