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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac477133fee555617d1dd289c40404c00cf67ec54137af1084e41dcf4f08ca2a' 
  AND token = '3j1O7fwhU7t6/DIoJN/fAzvDczmaN/7WGfhdRVlCke8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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