SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5884eab43ecedbdac5be8f0fa4b44c5a3a0362343b72f94f2df4512163d14a56' 
  AND token = 'LY0No80HSo1BJnOX/erxnqurVlvgz2gtGMh/GKqeamE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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