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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518e5ec89df4826b933728da41e4a6dc839f9b426e9564cec179d5268e8da1ac' 
  AND token = '0XH7N0ayLl6Mk5b63qRPob3TBtdagidxKf78fq45WvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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