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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '339a4fd82ea44627e566447b8acade849f326c457b371b3c905fb9576b08ceb8' 
  AND token = 'TWR7d8fDoNn4zsCi/39s5Eog0Qt2vxScoskqWF4fEhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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