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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bb561f1555cbf975026b502a7a92e5c96b8e4510b0bc967c2f50d24ec2d701' 
  AND token = 'aw83KgqozFy2NvHf0bL0uNKDXH0W5dBIWs4UwRgFe8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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