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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc0d439614675ee953e9a982d252a7655560e9b44fdb186de8d4e191530ee77' 
  AND token = 'XXa0nNwNsi7nniI9c04eDw4UY04OPe9waBiD2As+z1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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