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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dffc0d92a8fccfecdf094b35dff376c3e4940c106a5cec6a85cd626cf945fd2' 
  AND token = 'z/97Q1zGe1K/9AWfHZ0ckpCVsY7x71Z5UQHPpZMJz5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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