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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3781b8318b997aba7c64d570cf1557b3b53d9ecd4f6295634ae57502fc4dbb83' 
  AND token = 'xejH3MUHUe4QL5gH8kwJUzMLtECpgiOawxzetx/XbXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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