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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a218909f5eb20557a79eda0634b06bc3771498d6315e99e65a8f69b80d4105d8' 
  AND token = 'SJOy/YSKPbHK4/V03ynm1nHDWBb6KaiT5H98jMgckjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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