Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e54a301c9a72609fa1abd82edd0ee8d92275bad52c7f2abc08fb3cd06902854c' 
  AND token = 'fLuzTzAsSO4mMu1S9czvMK5fm7XGP2kXlTamNKzV1Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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