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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6b5fcdafe1e36dced5716578d3ce73bb2f93589cf8e8f3d7056b60fe82f653' 
  AND token = '/Q/NwULu1NSGcNA+Md5wkHuMS54j7YTBJPHOsIO7pp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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