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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa8506a4d2bf0b3c09430964af3fb2b9e416515f1be4cdb1ebb441c23f1f406' 
  AND token = '9KePzzxPtpeW55WnPDy3XCUUeR1PhSFf5bTMMC3ZXiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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