SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038673ed4795be18353cf6306300c47c368aa8078ffef9cd971497dc73745135' 
  AND token = 'jwB8ljGRV+ku8KkYRMxGruX6104ZmPLLDdLrvNtXOZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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