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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9342260857e05f9efd6c009040eba4ba3d0c8b2ac825a19d5a55dabfb781ba' 
  AND token = 'OL/pu8LpI+ACOw+OA5vmND8Hw4PYDiVcLVIuo0BXG3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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