SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebcbe489a08aa232d7cdb9961ed33f3a17baeac9c304e222d1f50a1527e1a6ed' 
  AND token = 'shNf/75qnWIgGRZYSBq3K/jMneG5Yl1f/vMNHksJXYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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