SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'debacf32bf983a42eb955c06d8c207e70176cc9f06b3ec7f270fd31db442fbd2' 
  AND token = 'CswaQGMBmAlCWoK1vJr1/Y17dRqdIf0JvrqRpZRHgWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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