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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8262e76ab75582b41698db98ccc1b6046129645662d207be54d1fb72b0892d45' 
  AND token = 't3us5UnjTypJDKAPfCgVjXo8pBtVeV7j+Mk1NO9BcRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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