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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ad07dba0498093a941e1c832206932ae8b919daf90f762892c9bd0e30a82c7' 
  AND token = 'gbNqWtDy+gwuOo4x11tbwfZBizYUc4TytPsRQqxg/vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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