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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff184709648e641a3046fdf72a86cf21cec7e5fd9e09889b612064aa5c5dc39' 
  AND token = 'nFM/n/WRphuTUCRB9/VGuxeqF9PbePW+t0eFO2SopZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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