SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ab93f4157c910a6208b0c010c07cfa429d58efcc95ed374022698a9bf46b5e' 
  AND token = 's0H/MORwizozs8H6YpqI/rTGgqoXTuBsMYVGcBtcvFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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