SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8e48be7f7f39b9acd94eac1d05152e125f2b8a4d53d91c534861269a08fb92' 
  AND token = 'gAziCIIf7LW0h/Z/mphjQqCvAG+l/OblNIwIuFmErL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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