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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28223dc90f408178fe83ca78be4047d3cfe77924ac47f75a53f992ab966e44e6' 
  AND token = 'mMelii6fAmE5xjHZuo4hu2iPV6ndFnNfZ6aRYjUvGgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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