Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9c5893b8b1df493f963d7ca3ba577f42249747c8d32a0f755e3defa8784ae1' 
  AND token = '83dLIbu2SFhZp9AGaUtSUB4wsi1WUMa7fN2g2SHFPVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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