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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8155d54c29259028c5c1c8acee3db00d9626bf9b75c72981a87a4ae0e72825' 
  AND token = 'O5BGmFNvWBP7GaELXD3uf0YO9ntgddQC/+vv8AGOM04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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