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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99607bb975588567e057459473a95fa1fd76e269f906f85436ac4ff359693c96' 
  AND token = '2mUulSpB6TXSNQHnbRym67i3GoAjOLCyzNZCVTEEUO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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