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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7113372b83178ac7ccd2182792946a076ab143279e5f6a2360dcb6c41d3ee4f' 
  AND token = 'VeHx0WOC7FwduOyaTJW8DxlR8rIiWBnZ/clucwIKKMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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