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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc5d2ef839edf68f384b776a06ea6957fc5c9bfede2a55b343affb61d5a5c3c' 
  AND token = 'JKGPdzSC37jH5jgSLzSam1tz6dz+qG1F6YdxmYIPr/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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