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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ac9005bc0198d2737f8391eedb912f8db754f8d979ba8d8ba880c5c1fc0a20' 
  AND token = '/+9ZvxfkTZChau5nKrHTPp90si9Na7lK5CVQ3CyluuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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