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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94600241dcf45d75fd2f69f1faa8faaadb38ab5e1a29a5cdff1ef288c78c7578' 
  AND token = 'LeH7XlA2ayb0pZesE0H2geNk6QIuaP5H+H3Qw8oe/xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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