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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2659060cc573695113fd32321b1bc7e3c1c03b1947d8cf56ebba0639cfa3ab2' 
  AND token = 'hox8czQhmyESMlAmzjJKZhl+8N/Lp9cxE3s7RSmBL9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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