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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bcc1a5424522d1d2e5d7c7bac7ac7dd56fd516c0131ab21d5e69557965b7960' 
  AND token = 'GNa0HHxzQUJtO67lN7yVth0XKv6Se7e9ZzxxQ8cAAVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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