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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb6e9a50f6f137bc7f85f318841870f4fb1a5dbc950b18102416f96455f198f' 
  AND token = 'byHabTZcCHcJT30R9w47WzX1wlTVxeFcRjsJKh+TaBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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