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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16e73937adb2c8e2d85e10e7dcb8722d7d07d3157fd3245ea1e8bce3a9c499d' 
  AND token = 'y3utdhwcU7gcY8goN3ES7VOpO44G/qrAYYOCuLvjyLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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