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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b59d274d11d90ab14c0d2def0d91454b44bb54263571192ae3334710eb2530' 
  AND token = '8S60g0fZkWfDdJZu7Y7U4YnqfI0DuvQ8C9cgwV+SzDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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