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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '216b878bcec1eca5551cd5d4abeef30ec642d0e0fca72ab9d09f44bf567b42e8' 
  AND token = 'Em72naWueArY/Fg0EfwK6hlVJYpYhPLhjwl1FEGcH8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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