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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e866a634d584ec74f14ca38c7bd17a46f230dffd2fd6966d7cc0bd68756aec' 
  AND token = 'B0obB8P7XFegilvSxOED+1Nm2pWtmCqF7Sy2SWviNv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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