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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede89e25b64818bb0ea5b6841f000dceaf597288bb7a5620ec3fd52449b124e8' 
  AND token = '7NGwA63BwcHMJlgO3kiy2+b1b4srVWNRzE/FIo11x98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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