SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc412bacf5a88bc339bec29bada4b8592229404f89d1b15bed76eaab0b895f7' 
  AND token = '/FweVXkBRx/CqZLeEA+45zPBmQ4KFG/vQmE/+GmKFuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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