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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234e96f98f8a6783a492ad7f2765c0293c854be81514eb1eff542b78b31000e4' 
  AND token = 'xbO0kjj53nJMDAPDAl7lYTGmVNoznYFKjpajxAlhj7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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