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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5529afc40fe4324a71f34fe5a1b14ea055b4eab6f98eb0166ac8db27fb0760' 
  AND token = '6+9155kAXUQEKkw7UFiKhyUzQTD95DoUWi10bEx/7c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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