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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dfe0a2339ef8a6a3b6ac5d9859813a04e437177dcdc338dc3037c1ac0043559' 
  AND token = 'rVog1Zlb4I7rIomvdHSe9XxiciczxGNXYy4umB1IVC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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