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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173171277be3c76cc0391b6da53f566b9f693197c8c77ee06eadf2be1caa2677' 
  AND token = '90tOAUAtyPp46OpYmfOxlUbgXkIkbV+7FOOMgnjb+Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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