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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836ea14e37119a23441d864157051b5389b169eb858520e24971f22305e3a46c' 
  AND token = 'h/gQMpKv9eD5TZyolH74wb7Sj3MvZ/caJqS32OAL/Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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