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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f8cd70ccca1ea8d11a54c4ca8ee0e6897fde3dd2dff9db0ea2904df0e814b2f' 
  AND token = 'kGheitxBR8oKdJc7oinndfCRfW83w1H3Bv3+Ipw1+T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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