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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13b3429b722ae44efd8b206d606441e1401fc86c433c0d1e24a5f0d7fd12764' 
  AND token = 'ze8qK//edAFWZAZdF3gLl5glwzf45EkX+kAzEVzZMnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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