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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ac1319ec0ada6ce0a9f209390abdc6cfca5a3e6c2555fa176724be88300e82' 
  AND token = 'IUjrQt3AcUcxTLtJMaxxYNmnnp+obBZ72arBtbPQTUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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