SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f09cb4da025399175348e57b6b53e82e5761f5e3dbd73f4f3e40380a74bc75e' 
  AND token = 'OWi8/LTTdYTPDjeLF4+sXpmmPao/xqGjvUC7K/FRmAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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