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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cafb83f4ded481e779d54f32e59e258dc7e8e8f44d19ae55af08759996d0682' 
  AND token = 'Q9ZJGcjsjtvO80ulia+PkU+SvMbp/jyP8m/MIdRWRUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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