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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000970785f30e137b4d86c7c5433113f5871db2ff79ca91e52ccc1bee071c445' 
  AND token = 'kev6guPbglQ13XXABushI4Hevb6SQUycK6xUM7c7wqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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