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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9568713a4161e9cbf32eea02696aabc0f8c8a698bd502f3a6d1dba2649efab55' 
  AND token = 'DO1HYm35o/sq8TYLGbSr8F54HaO/AIsfZ5oV/CBqb8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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