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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad95c837b3013f8efb9e553515173d9224b9b364ceb275d93012397aa603581' 
  AND token = '/UUzBu+DZkRV/nw1Agar/FNav0r6MFulMbnSkbKF5iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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