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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a6dd8fba82f8e9ec7a0b6d20dacc602ba98a5a3dbae5d2ce4f24ce7d0818de' 
  AND token = 'FR3jDNsvNiNSK9HHMBmkUB3ezNMz9HAyh/iQem9IXd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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