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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938cc107017379b451743e388c392b736b6b9f246a77e48b66def0b41be73861' 
  AND token = 'VNf5DjE+KzFVuVfjzH6CNbULXaIYMs27hoezmnOqaAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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