SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033355f4b81c8d4e4968153ed077d28bed392343afd1b953a5ec3264b576ba6d' 
  AND token = 'NH4Bda6Lp3G3nRLwzwkZIYz5xUZKISXiPIRDvv/9B1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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