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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '161dcad34684022484088ad70ee733d0f5071af009168d1b00be78bdf4ed0fc7' 
  AND token = 'yJjdg9JFgyQI9M1Wz8ftpcEZYc92WnYuV3rmkfLBX+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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