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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d13f25cf39f05c956ab5236af8581e8df17f7cf7b5d5dc93064daf683e305cd' 
  AND token = 'TWo9QO281ouD1E4+SbOcF6tb03GNtj9E5CuzrYnD2OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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