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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbaaf08a338deb6fdf5957385082c7548e575938c395d1c9241903394b727adb' 
  AND token = 'QwclOuVileSrh1MVAR/EK2yO13cFVDwmwPia+5nQaI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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