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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '495923bd5567381b3f261af746711aaa31f028e26796e651f9aec7cc9b79b917' 
  AND token = '/m+AbCNDAhrdgDMATD9B5lPVveK/CFG0utbOb1lRCrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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