SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630d314aeba8d4464827167df92be1298ec688f59cd7466d980a948f8f0b0fa2' 
  AND token = 'mUwHKkax14usf+mtbnCmQSg9Nw1K/yBNB/o87j3J/Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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