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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28faf5bf22a548fc4000a9d87aa6cc99d13645de51241585a07e8ae79183eeb' 
  AND token = 'oSa+7DkBo778u1m5m5E8BaN9kxG+ECG3wwBFz5oLd0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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