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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16286dae8813ec154e6781eca86863c58558f8427c415883d2ecf6e653f04f39' 
  AND token = 'AbMZv1LCoMg+zVaWZ+07N4JkRh1XBGsdkumFuvlWe+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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