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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b685a133c7a8357c8de7fb541b8ea02a781d72f06fc65f36a6ca236e5209828' 
  AND token = '24CNt/ob2ypSTvTbT4Q7BEJQi3rDKhFGHFpRxI0fAgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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